FEMTOCLOCKS™ CRYSTAL-TO-LVDS

CLOCK GENERATOR

ICS844021I-01

1

ICS844021BGI-01 REV. C SEPTEMBER 27, 2007

PRELIMINARY

The ICS844021I-01 is an Ethernet Clock Generator

performance devices from IDT. The ICS844021I-

01 uses an 18pF parallel resonant crystal over the

range of 24.5MHz – 34MHz. For Ethernet appli-

cations, a 25MHz crystal is used. The ICS844021I-01 has

excellent <1ps phase jitter performance, over the 1.875MHz –

20MHz integration range. The ICS844021I-01 is packaged in a

small 8-pin TSSOP, making it ideal for use in systems with

limited board space.

• One Differential LVDS output

• Crystal oscillator interface, 18pF parallel resonant crystal

(24.5MHz – 34MHz)

• Output frequency range: 122.5MHz – 170MHz

• VCO range: 490MHz – 680MHz

• RMS phase jitter @ 125MHz, using a 25MHz crystal

(1.875MHz – 20MHz): 0.32ps (typical) @ 3.3V

• 3.3V or 2.5V operating supply

• -40°C to 85°C ambient operating temperature

• Available in both standard (RoHS 5) and lead-free (RoHS 6)

packages

HiPerClockS™

ICS

ICS844021I-01

8-Lead TSSOP

4.40mm x 3.0mm x 0.925mm

package body

G Package

Top View

GND

XTAL_OUT

XTAL_IN

1

2

3

4

Q

nQ

OE

8

7

6

5

OSC

Phase

Detector

VCO

490MHz - 680MHz

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XTAL_OUT

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1

The Preliminary Information presented herein represents a product in pre-production. The noted characteristics are based on initial product characterization

and/or qualification. Integrated Device Technology, Incorporated (IDT) reserves the right to change any circuitry or specifications without notice.